Peterskirche, or the Church of St. Peter, is the most lavishly decorated church in Vienna, and stands on what perhaps is the oldest Christian worshipping grounds in the city.

Although the church itself dates back only until the early 18th century, it is believed that this site was used for worship as far back as the 4th century.

The church is located just off the pedestrianized Graben, one of the busiest streets in the city, yet it can still be easy to miss. The church seems to have been squeezed into position, and without looking to the sky to notice the church's towering domes, you might just mistake the entrance for another one of Vienna's ornate residential buildings.

Inside are a number of artworks from the 18th century, but probably the most imposing feature is the frescoed dome directly above the alter.